Rudolph ehmer



R. EHMER.

(Model.)

Latch No. 240,39?l

Patented April 19,1881

Illllll NPETEkS. PMOTD-L|TMOGRAPHER. WASHINGTON, DAI.

UNITED STATES 'PATENT OFFICE.

RUDOLPH EHMER, 0F NEW YORK, N.` Y.

LATCH.

SPECIFICATION forming part of Letters Patent No. 240,397, dated April19, 1881.

Application filed February 21, 1881. (Model.)

To all whom it may concern:

Be it known that l, RUDOLPH EHMER, of New York, county of New York, andState of New York,have inventedanew and Improved Reversible Latch-Lock,of which the following specification is a full, clear, and exactdescription.

In the accompanying drawings, Figure 1 is a face view of my improvedlock with the faceplate removed, showing the parts in their positionwhen the lock is closed. Fig. 2 is a similar view with the look open.Fig. 3 is a top View of the escutcheon, Fig. 4, a transverse section onthe line cc w, Fig. 1; Fig. 5, a similar section on the line yy, Fig. 3,and Fig. 6, a perspective view ot' the key.

Similar letters of reference indicate corresponding parts in all thefigures.

This invention relates to several improvements in reversiblelatch-locks; and it consists, rst, of the combination, in a look havinga latch and bolt, of an eye through which the bolt passes with a slideupon the bolt, an operating-cam, and two springs of different tension;secondly, in the combination of a lockcase and operating mechanism withan escutcheon, composed of a cylinder, cam, lower portion, and set ofpins and springs, and with a spring and knob,the shank of said knobresting upon said spring and extendinginto a central hole of thecylinder; finally, the invention consists in the combination of alookcase and operating mechanism, and an escutcheon having holes out ofplane with each other, with a key which is composed of two flat keysriveted together, saidiat keys having their bits turned outward, so thatthe pins on the bits it into the holes of the escutcheon, all as ishereinafter more fully pointed out.

In the drawings, A is the lock-case, a being the removable face-plate.

b is the latch; c, the bolt to which the latch is attached, said boltpassing through an eye, c, secured to the inner side of the lock-case.The bolt is of such alength that its end strikes against the end of thelock-case when the lock is open.

fis thecam for operatingthebolt. This cam may be revolved by the knob g,(indicated in dotted lines in Fig. 1,) and is pivoted in line with theaxis ot' the bolt c and between the eye c and the end of the bolt.

h. is a slide upon the rear portion ot bolt c, said bolt being providedat its end with a head, i, which prevents said slide from slipping oft'.The slide h is notched atj, opposite the cam.

k is the spiral lock-spring, wound around the bolt c, between the eye cand latch b.

lis a second spiral spring, of less tension than the spring k, and woundaround the bolt c, between the slide h and head i: The two arms m m ofthe cam j' are longer than the length of the latch b, so that the lockmay be entirely opened by but partly turning the knob g.,

lf it is desired to hold the lock permanently open the cam f is turnedso far as to bring its arms in line with the axis of the bolt c. (Dottedlines in Fig. 2.) In this case the arm m opposite the slide h willgradually crowd said slide backward, compressing spring l until the endof said arm falls into the notch j of slide 7L, holding the slide back.As the spring k is ot' greater tension than the spring Z the latch bwill have been drawn into the lock-case and held in position as long asthe cam holds the slide back. A partial revolution of the cam will freethe slide, allow the springs k and lto expand, and close the latch. lfthe lock is to be reversed the latch bis drawn out of the case to itsfull length, and is turned around with its bolt c.

B is the escutcheon, n its revolving cylinder, and o the correspondingportion below the same, rigidly attached to theface-plate a.. B v meansof a cam, w, attached to the lower end of the cylinder n,the boltof thelock is moved. Through the cylinder n and lower portion, o, holes aredrilled, not in plane with each other, as customary, but out of plane-towit, at the four corners ot' a rectangle-as shown in Fig. 3. Within thefour holes are the two sets of pins pppp and p' p', &c., and spiralsprings q q, Snc., as customary, the lower pins, p p',

&c., being of equal, and the upper pins of unequal, length, so that' thefaces of the pins when turned and the lock composed of two fiat rivetedtogether lengthwise, and

must be brought in line by the key D the cylinder is to be opened. Thekey Dl is keys, r fr,

having their bits turned outward, so that the pins s s on the bits titinto the four holes of cylinder n. In this Way greatseeurityis given.Within the cylinder n an additional central hole is drilled, extendingbut part-ly through the cylinder. Into this hole ts the shank of a knob,t, resting upon a spring, u. This knob is situated between the fourholes of the cylinder, and is depressed by the key when the latter isinserted. The slotted cap u, extending` over the knob t and cylinder n,and fastened to the lower portion, 0, of the escutcheon, serves to keepthe knob in place.

I claim as my inventionl. The combination, in a lock, of the latch b,bolt c, can] f, eve e, springs 7s and l, and

slide h, substantially as and for the purpose herein shown anddescribed.

2. The combination of a lock-case, A, and operating mechanism, with theescutcheon B,

which is composed of cylinder u, cam w,lower portion, o, pins pppp,springs g q, and of the spring u and knob t, the shank of said knobresting upon said spring and extending into a central hole of thecylinder n, substan I tially as and for the purpose specified. i 3. Thecombination of' a lock-ease, A, and operating mechanism, and theescutcheon B, having` holes out ofplane with eaoh other, with the key D,which is composed of two flat keys, r 1^, riveted together, said flatkeys having their hits turned outward, so that the pins ss on the bitsfit into the holes of the escutoheon B, substantially as and for thepurpose specied. RUDOLPH EHMER.

Witnesses F. V. BnrnsEN, Jos. J. MCGINLEY.

